室分常用的計(jì)算公式、自動(dòng)換算(實(shí)用型)-

駐波比SWR與回波損耗換算,,,,,,,駐波比SWR與回波損耗換算,,,,,,,注釋,

輸入SWR=,,1.5,則回波損耗=,,13.97940009,0.2,輸入SWR=,,1.5,則回波損耗=,,13.97940009,0.2,T=√Pr/√PoPo=輸入功率Pr=反射功率,

輸入回波損耗=,,15.56303,則SWR=,,1.399999724,0.166666571,輸入回波損耗=,,15.56303,則SWR=,,1.399999724,0.166666571,"回波損耗Hdb＝20log(1/T)＝20log[(SWR+1)/(SWR-1)]

＝-20Log[(SWR-1)/(SWR+1)]",

,,,,,,反射系數(shù),,,,,,,反射系數(shù),,

W與dBm換算,,,,,,,W與dBm換算,,,,,,,,

輸入W數(shù)值=,,0.3,則對(duì)應(yīng)的dBm=,,24.8,dBm,輸入W數(shù)值=,,5,則對(duì)應(yīng)的dBm=,,37.0,dBm,,dBm＝10Log(W*1000)

輸入dBm數(shù)值=,,13.6,則對(duì)應(yīng)的瓦數(shù)=,,0.022908677,W,輸入dBm數(shù)值=,,13.6,則對(duì)應(yīng)的瓦數(shù)=,,0.022908677,W,,W＝10次冪(dBm*0.1-3)

空間鏈路損耗計(jì)算,,,,,,,空間鏈路損耗計(jì)算,,,,,,,,

輸入頻率(MHz)=,,2400,則純空間鏈路損耗=,,54.0,dB,輸入頻率(MHz)=,,2100,則純空間鏈路損耗=,,58.8,dB,純空間鏈路損耗L＝32.4+20LogF(MHz)+20LogD(Km),

天線覆蓋半徑(米)=,,5,,,,,天線覆蓋半徑(米)=,,10,,,,,,

輸入阻擋損耗值FAF＝,15,35,則到邊緣的鏈路損耗=,,90.0,dB,輸入阻擋損耗值FAF＝,15,25,則到邊緣的鏈路損耗=,,87.8,dB,室內(nèi)損耗＝1米空間損耗L(1)+20Log(D/1)＋αD＋FAF,

輸入衰耗因子α＝,,0.2,,,,,輸入衰耗因子α＝,,0.4,,,,,α一般取0.5，F(xiàn)AF為穿透損耗,

室內(nèi)覆蓋邊緣場(chǎng)強(qiáng)計(jì)算,,,,,,,室內(nèi)覆蓋邊緣場(chǎng)強(qiáng)計(jì)算,,,,,,,,

天線口功率dBm,,18,則邊緣場(chǎng)強(qiáng)＝,,-69.0,dBm,天線口功率dBm,,3,則邊緣場(chǎng)強(qiáng)＝,,-82.8,dBm,,邊緣場(chǎng)強(qiáng)＝天線口功率+天線增益-鏈路損耗

天線增益dBi,,3,,,,,天線增益dBi,,2,,,,,,

電平的加減計(jì)算,,,,,,,電平的加減計(jì)算,,,,,,,,

輸入電平P1＝dB,,-119,則P1＋P2＝,,-116.5,dBm,輸入電平P1＝dB,,-119,則P1＋P2＝,,-116.5,dBm,先換算成線性值(功率)，加減后再換算成電平,

輸入電平P2＝dB,,-120,,,,,輸入電平P2＝dB,,-120,,,,,,

輸入電平P1＝dB,,-103,則P1-P2＝,,-107.3,dBm,輸入電平P1＝dB,,-103,則P1-P2＝,,-107.3,dBm,,

輸入電平P2＝dB,,-105,,,,,輸入電平P2＝dB,,-105,,,,,,

天線口1m處電磁輻射功率密度,,,,,0.001823068,W/m2,天線口1m處電磁輻射功率密度,,,,,0.001823068,W/m2,,天線功率（線性值）/球面積

,,,,,,,,,,,,,,,1m球面積公式S=4πR2=12.566

天線口2m處電磁輻射功率密度,,,,,0.000455985,W/m2,天線口2m處電磁輻射功率密度,,,,,0.000455985,W/m2,,

,,,,,0.455984803,,,,,,,0.455984803,,,2m球面積公式S=4πR